It would be awesome to have a sort of slide show module you can drag onto the artwork. The module would be resizable like any rectangle and it would be similar to the "repeat grid" where you can drop multiple images and text.

In edit mode you can see/edit the contents of each slide.

It comes with right/left arrow objects you can edit graphically and small circles are added dinamically acording to the amount of slides. You can choose to hide the arrows and circles if you want.

By default it just works with the arrows and it allows you to specify the scrolling speed/ease. But you can choose to make it work automatically every x seconds.

The ability to scroll horizontally

This must have that cool green 'Feature-Started' stamp under itself. Ability to have horizontal scroll is pretty straight forward. This is how I imagine, one would nest a smaller artboard inside the main window artboard and make a rectangle inside nested artboard wider than the artboard. This smaller artboard then have horizontal scrolling just like vertical scrolling works. If there is already a way to do this then someone let me know. I hope I was able to explain myself.

This would be very helpful with the amount of carousels that are on the web and in apps today.

A horizontal scroll, to suppress the area occupied by the vertical direction you can increase the amount of elements that go into a single screen.

Example：
- http://unitid.nl/androidpatterns/uap_pattern/horizontal-scrolling-page-indicators
- http://unitid.nl/androidpatterns/uap_pattern/slideable-top-navigation
- http://unitid.nl/androidpatterns/uap_pattern/scrollable-rows

ability to extend artboard for horizontal scrolling prototypes. Same action as the vertical. Could have a simple action where you can extend artboard either across or down (not both)